MD_DataIdentification

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2006 OSIP OGRIP Coastal Counties LiDAR Survey

The 2006 OSIP digital LiDAR data was collected during the months of March and May
(leaf-off conditions). The LiDAR covers the entire land area of the northern tier
of Ohio (approximately 23,442 square miles. The LiDAR is delivered in county sets,
consisting of 5,000' x 5,000' size tiles. Where the State borders other states (land
only), the entire border of the State is buffered by at least 1,000-feet. Along the
Lake Erie Shoreline ortho coverage is buffered beyond the shoreline a minimum distance
of 2,500-feet. Adjacent flight lines overlap by an average of 30 percent. LiDAR was
collected with Leica ALS50 digital LiDAR Systems. The file naming convention is as
follows: Nxxxxyyy = 5,000' x 5,000' LiDAR Tiles located in the Ohio State Plane Coordinate
System (North Zone). Sxxxxyyy = 5,000' x 5,000' LiDAR Tiles located in the Ohio State
Plane Coordinate System (South Zone). Please note that xxxx and yyy represent the
easting and northing coordinates (respectively) in state plane feet, The naming convention
for each LiDAR tile is based upon (the bottom most-left pixel). The LiDAR was provided
in LAS Format containing the above ground and bare-earth LiDAR features. Ownership
of the data products resides with the State of Ohio. Orthophotography and ancillary
data products produced through this contract are public domain data. LiDAR was acquired
Statewide to provide a solid and very accurate base to use during the image rectification
process. This same LiDAR can be supplemented with 3D breaklines to generate 2-foot
and/or 4/5-foot contours. The average post spacing between LiDAR points is 7-feet.
The flying altitude was 7,300-feet AMT, with the targeted flying speed at 170 knots.

State of Ohio, through the Office of Information Technology, Investment and Governance
Division, for the Office of Information Technology, Services Delivery Division and
the Ohio Geographically Referenced Information Program (OGRIP)

These data depict the elevations at the time of the survey and are only accurate for
that time. Users should be aware that
temporal changes may have occurred since this data set was collected and some parts
of this data may no longer represent actual surface
conditions. Users should not use this data for critical applications without a full
awareness of its limitations. Any conclusions drawn
from analysis of this information are not the responsibility of NOAA or any of its
partners. These data are NOT to be used for navigational purposes.

Data was dowloaded from http://gis5.oit.ohio.gov/geodatadownload/ Standard OSIP imagery
and elevation products were collected from 2006 - 2008. To date 36 of the states 88
counties have taken advantage of the OSIP program to obtain enhanced imagery and elevation
data through a Cooperative Purchase Agreement (CPA) with the State of Ohio. The CPA
benefits the state by providing enhanced resolution products OSIP while saving participating
counties an estimated 4.5 million in taxpayer dollars over the cost of obtaining these
imagery, LiDAR and elevation products individually. The savings are due in large part
to the economy of scale realized through a statewide program and the fact that the
state is responsible for the cost of project administration Any information regarding
acquisition, dissemination or updates should be directed to the contact information
within this metadata or found on the OSIP OGRIP website.

1

2013-08-19T00:00:00

The NOAA Coastal Services Center (CSC) receieved the data from: http://gis5.oit.ohio.gov/geodatadownload/
Downloaded in las format. The files contained LiDAR elevation and intensity measurements.
The data were in Ohio State Plane North (SP83 3401, feet) and NAVD88 vertical datum
(in feet, assumed Geoid03). CSC performed the following processing for data storage
and Digital Coast provisioning purposes: 1. The data were converted from Ohio State
Plane North (3401, feet) coordinates to geographic coordinates. 2. The data were converted
from NAVD88 (orthometric) heights to GRS80 (ellipsoid) heights using Geoid03. 3. The
data were sorted by time and zipped to laz format. 4. The data were then cleaned of
errant points, determinant of specific county high and low values. As follows: County,
Points above elevation removed (meters), Points below elevation removed (meters) Lucas,105,292;
Ottawa,120,208; Sandusky,125,none removed ; Erie,103,298; Lorain,103,284; Cuyahoga,131,586;
Lake,137,390; Ashtabula,134,398. 5. The individually obtained counties from the Lake
Erie coast were combined to form an eight county entity for NOAA's archiving and storage.
6. The data were converted to LAZ format.

1

2013-10-17T00:00:00

The NOAA National Geophysical Data Center (NGDC) received lidar data files via ftp
transfer from the NOAA Coastal Services Center. The data are currently
being served via NOAA CSC Digital Coast at http://www.csc.noaa.gov/digitalcoast/.
The data can be used to re-populate the system. The data are archived in LAS or LAZ
format.
The LAS format is an industry standard for LiDAR data developed by the American Society
of Photogrammetry and Remote Sensing (ASPRS); LAZ is a loseless compressed version
of
LAS developed by Martin Isenburg (http://www.laszip.org/). The data are exclusively
in geographic coordinates (either NAD83 or ITRF94). The data are referenced vertically
to
the ellipsoid (either GRS80 or ITRF94), allowing for the ability to apply the most
up to date geoid model when transforming to orthometric heights.